Excitation of different chromium centres by synchrotron radiation in MgO:Cr single crystals

E. Shablonin; A. I. Popov; A. Lushchik; A. Kotlov; S. Dolgov

doi:10.1016/j.physb.2015.08.032

Excitation of different chromium centres by synchrotron radiation in MgO:Cr single crystals

E. Shablonin
, A. I. Popov^*
, A. Lushchik
, A. Kotlov
, S. Dolgov

^*Corresponding author for this work

Laboratory of Kinetics in Self-Organizing Systems, Institute of Solid State Physics

University of Tartu
German Electron Synchrotron

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

The excitation spectra for the emissions of chromium-containing centres have been measured at 10 K using synchrotron radiation of 4-32 eV in MgO single crystals with different content of Cr³⁺ (5-850 ppm) and Ca²⁺ impurity ions. Both virgin crystals and the samples preliminarily irradiated with x-rays at 295 K have been studied. The role of complex chromium centres containing two Cr³⁺ and a cation vacancy (sometimes nearby a Ca²⁺ ion) on the luminescence processes and the transformation/creation of structural defects has been analysed. Such anharmonic complex centres could serve as the seeds for the creation of 3D defects that facilitate the cracking and brittle destruction of MgO crystals under their irradiation with ∼GeV heavy ions providing extremely high excitation density within cylindrical ion tracks.

Original language	English
Pages (from-to)	133-136
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	477
Issue number	1
DOIs	https://doi.org/10.1016/j.physb.2015.08.032
Publication status	Published - 15 Nov 2015

Keywords

Impurity centres
Luminescence
MgO
Synchrotron radiation

OECD Field of Science

1.3 Physical Sciences

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10.1016/j.physb.2015.08.032

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title = "Excitation of different chromium centres by synchrotron radiation in MgO:Cr single crystals",

abstract = "The excitation spectra for the emissions of chromium-containing centres have been measured at 10 K using synchrotron radiation of 4-32 eV in MgO single crystals with different content of Cr3+ (5-850 ppm) and Ca2+ impurity ions. Both virgin crystals and the samples preliminarily irradiated with x-rays at 295 K have been studied. The role of complex chromium centres containing two Cr3+ and a cation vacancy (sometimes nearby a Ca2+ ion) on the luminescence processes and the transformation/creation of structural defects has been analysed. Such anharmonic complex centres could serve as the seeds for the creation of 3D defects that facilitate the cracking and brittle destruction of MgO crystals under their irradiation with ∼GeV heavy ions providing extremely high excitation density within cylindrical ion tracks.",

keywords = "Impurity centres, Luminescence, MgO, Synchrotron radiation",

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T1 - Excitation of different chromium centres by synchrotron radiation in MgO:Cr single crystals

AU - Shablonin, E.

AU - Popov, A. I.

AU - Lushchik, A.

AU - Kotlov, A.

AU - Dolgov, S.

PY - 2015/11/15

Y1 - 2015/11/15

N2 - The excitation spectra for the emissions of chromium-containing centres have been measured at 10 K using synchrotron radiation of 4-32 eV in MgO single crystals with different content of Cr3+ (5-850 ppm) and Ca2+ impurity ions. Both virgin crystals and the samples preliminarily irradiated with x-rays at 295 K have been studied. The role of complex chromium centres containing two Cr3+ and a cation vacancy (sometimes nearby a Ca2+ ion) on the luminescence processes and the transformation/creation of structural defects has been analysed. Such anharmonic complex centres could serve as the seeds for the creation of 3D defects that facilitate the cracking and brittle destruction of MgO crystals under their irradiation with ∼GeV heavy ions providing extremely high excitation density within cylindrical ion tracks.

AB - The excitation spectra for the emissions of chromium-containing centres have been measured at 10 K using synchrotron radiation of 4-32 eV in MgO single crystals with different content of Cr3+ (5-850 ppm) and Ca2+ impurity ions. Both virgin crystals and the samples preliminarily irradiated with x-rays at 295 K have been studied. The role of complex chromium centres containing two Cr3+ and a cation vacancy (sometimes nearby a Ca2+ ion) on the luminescence processes and the transformation/creation of structural defects has been analysed. Such anharmonic complex centres could serve as the seeds for the creation of 3D defects that facilitate the cracking and brittle destruction of MgO crystals under their irradiation with ∼GeV heavy ions providing extremely high excitation density within cylindrical ion tracks.

KW - Impurity centres

KW - Luminescence

KW - MgO

KW - Synchrotron radiation

UR - https://www.scopus.com/pages/publications/84940383692

U2 - 10.1016/j.physb.2015.08.032

DO - 10.1016/j.physb.2015.08.032

M3 - Article

AN - SCOPUS:84940383692

SN - 0921-4526

VL - 477

SP - 133

EP - 136

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1

ER -

Excitation of different chromium centres by synchrotron radiation in MgO:Cr single crystals

Abstract

Keywords

OECD Field of Science

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